Interfacial Flow around Brownian Colloids
Interfacial Flow around Brownian Colloids
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DOI：
10.1103/physrevlett.126.228003
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发表时间：
2021-06-02
影响因子：
8.6
通讯作者：
Stebe, Kathleen J.
中科院分区：
文献类型：
--
作者：
Molaei, Mehdi;Chisholm, Nicholas G.;Stebe, Kathleen J.
了解粒子运动在界面处产生的流动是理解流体动力学相互作用和胶体自组织的关键一步。我们发展了相关位移测速技术来测量界面捕获的布朗粒子周围的流场。这些流场可以分解为界面流体动力学多极流，包括力偶极子流和偶极流。这些结构为理解界面的机械响应提供了关键的见解。重要的是，流动结构表明，界面是不可压缩的，为缺乏表面活性剂附近的理想气态，并包含有关界面特性和流体动力学耦合与散装流体的信息。相同的数据集可用于预测界面对所施加的复杂力的响应，从而实现产生高阶界面多极的虚拟实验。
Understanding the flow created by particle motion at interfaces is a critical step toward understanding hydrodynamic interactions and colloidal self organization. We have developed correlated displacement velocimetry to measure flow fields around interfacially trapped Brownian particles. These flow fields can be decomposed into interfacial hydrodynamic multipoles, including force monopole and dipole flows. These structures provide key insights essential to understanding the interface's mechanical response. Importantly, the flow structure shows that the interface is incompressible for scant surfactant near the ideal gaseous state and contains information about interfacial properties and hydrodynamic coupling with the bulk fluid. The same dataset can be used to predict the response of the interface to applied, complex forces, enabling virtual experiments that produce higher order interfacial multipoles.